<template>
  <div>
     <!--面包屑导航 区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
       <el-alert :closable="false" title="添加商品信息" type="info" center show-icon></el-alert>
       <el-steps align-center :space="200" :active="activeIndex - 0" finish-status="success">
         <el-step  title="基本信息"></el-step>
         <el-step title="商品参数"></el-step>
         <el-step title="商品属性"></el-step>
         <el-step title="商品图片"></el-step>
         <el-step title="商品内容"></el-step>
         <el-step title="完成"></el-step>
       </el-steps>
       <el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
       <el-tabs @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex" :tab-position="'left'">
         <el-tab-pane label="基本信息" name="0">
           <el-form-item label="商品名称" prop="goods_name">
             <el-input v-model="addForm.goods_name"></el-input>
           </el-form-item>
           <el-form-item label="商品价格" prop="goods_price">
             <el-input v-model="addForm.goods_price" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品重量" prop="goods_weight">
             <el-input v-model="addForm.goods_weight" type="number" ></el-input>
           </el-form-item>
           <el-form-item label="商品数量" prop="goods_number">
             <el-input v-model="addForm.goods_number" type="number" ></el-input>
           </el-form-item>
           <el-form-item label="商品分类" prop="goods_cat">
             <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="{ expandTrigger: 'hover', label: 'cat_name', value: 'cat_id', children: 'children' }" @change="handleChange"></el-cascader>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品参数" name="1">
           <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
             <el-checkbox-group v-model="item.attr_vals">
               <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
             </el-checkbox-group>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品属性" name="2">
           <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
             <el-input v-model="item.attr_vals"></el-input>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品图片" name="3">
           <el-upload :on-success="handlerSuccess" :action="uploadUrl" :headers="headerObj" :on-preview="handlePreview" :on-remove="handleRemove"
             list-type="picture">
             <el-button size="small" type="primary">点击上传</el-button>
             <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
           </el-upload>
         </el-tab-pane>
         <el-tab-pane label="商品内容" name="4">
           <!--富文本编辑组件-->
           <quill-editor v-model="addForm.goods_introduce">
           </quill-editor>
           <el-button class="btnAdd" @click="add" type="primary">添加商品</el-button>
         </el-tab-pane>
       </el-tabs>
       </el-form>
    </el-card>
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 商品分类列表
      cateList: [],
      // 动态参数列表数据
      manyTableData: [],
      onlyTableData: [],
      uploadUrl: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x =>
        x.pic === filePath
      )
      this.addForm.pics.splice(i)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handlerSuccess (response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项')
        // 执行添加的业务逻辑
        // 实现深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
